Muffler.



0. C. & W. H. UNKE.

MUFFLER. APPLICATION FILED JULY 30, 1913.

Patented May 19, 1914.

UNITED STATES PATENT ()FFICE.

OTTO C. UNKE AND WILLIAM H. UNKE, OF MILWAUKEE, WISCONSIN.

MUFFLER.

Specification of Letters Patent.

Patented May 19, 1914.

To all whom it may concern Be it known that we, OTTO C. UNKE and IVILLIAM H. UNKE, citizens of the United States, and residents of Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented new and useful Improvements in Mufflers. of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention has for its object to provide a muflier for use with gas engines and the like which will be simple and inexpensive in its construction, though efficient in use, to subdue the noise of the discharge of exhaust gases by equalizing the flow thereof from an intermittent speedy travel to a continuous slower travel.

WVith the above and other objects in view the invention consists in the mutlier as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in different views: Figure 1 is a longitudinal sectional view of a muffler constructed in accordance with this invention; and, Fig. 2 is a similar view of a modified form thereof.

In the drawings the muffler of this invention is shown to be constructed entirely of sheet metal drawn or otherwise formed into the desired shape, although it is obvious that other material may be employed. In these drawings 10 indicates a cylindrical casing around the ends of which are fitted a pair of funnel-shaped end pieces-11 and 12, the central opening of the intake end piece being larger than that of the outlet end piece and being adapted to be connected with the exhaust manifold or exhaust pipe of a gas or internal combustion engine while the central opening of the outlet end piece is adapted for connection with a discharge tube 13. The end pieces 11 and 12 after fitting on the ends of the cylindrical casing 10 have their edgesbent back or reversed to lie a short distance away from the cylindrical casing 10 and an outer cylindrical jacket 14: fits upon these outwardly bent edges of the end pieces 11 and 12 to form a tightly closed air space 15 surrounding the muflier. Within the cylindricahcasing 10 there are two or more funnel-shaped baflie members 16 which are preferably reversely bent in section as shown and which are spaced a short distance apart and are secured at their; ;outer edges txge walls of the cylindrical casing 10, pre rably by electrically welding them. Near the discharge end or outlet end of the cylindrical casing 10 there is a cup-shaped deflector member 17 with its closed rounded end of smaller diameter directly in linewitlr the passageway openings through the funnel-shaped bafiie members 16 and spaced a short distance therefrom while near its outer edge it is provided with a series of openings 18 extending around it and admitting the partially expanded gases from the chamber between the baflie members and the deflector member 17 to the interior of the somewhat globular-shaped chamber between the deflector member 17 and the end piece 12.

In operation the exhaust gases issuing from the engine intermittently and at a high speed are admitted to the muflier through the inlet end piece 11 and are immediately permitted to expand in the somewhat globular-shaped chamber between the first baflie member 16 and said end piece 11 so that their discharge from this preliminary chamber is somewhat more continuous than the direct exhaust from the engine and the speed of travel is correspondingly reduced. In their passage through the reduced opening of the first bafiie member 16 the exhaust gases are again confined to a narrow passageway and between the two or more baffle members 16 they meet with surrounding speed retarding pockets in which there is a further tendency to equalize the speed of travel by prolonging the duration of the impulses of travel. When the gases have passed through the battle members 16 they come in contact with the rounded projecting end of the deflector member 17 by which they are deflected outwardly in all directions into the chamber between the deflector member 17 and the baflie member 16 and from this chamber they pass through the engine without materially choking the travel of such exhaust gases so as to im pede the operation of the engine.

In the modified form of the construction shown in Fig. 2 the end pieces 11 and 12 are provided with water pipe connections 19 admitting water to the muffler at the top of the intake end piece 11 and discharging water from the bottom of the outlet end piece 12 and water may be caused to travel through the muffler from the water pipe 19 to the water pipe 20 in order to heat the water from the exhaust gases or to reduce the temperature of exhaust gases as desired.

What we claim and desire to secure by Letters Patent is:

1. A muffler, comprising a casing having an inlet and outlet passageway, a plurality of funnel-shaped baffle members secured within the casing and spaced apart to form one or more annular speed retarding pockets around the passageway through them, and one or more deflector members secured within the casing with its closed central part in the line of travel of the gases through the baffle members and provided with openings near its outer edge.

2. A muffler, comprising a casing having an inlet and outlet passageway, a plurality of funnel-shaped baffle members secured within the casing and spaced apart to form one or more annular speed retarding pockets around the passageway through them,'and one or more cup-shaped deflector members secured within the casing with-its closed smaller end in the lineof travel of the gases through the baffle members and provided with a series of openings near its outer edge.

3. A muffler, comprising a cylindrical cas ing, funnel-shaped end pieces secured to the ends thereof, funnel-shaped baffle members within the casing and spaced apart, a cup-shaped deflector member fitting within the casing with its closed smaller end in the line of travel of the gases through the baffle members and provided with a series of openings near its outer edge, and a jacket ing and spaced apart to form an annular speed reduction chamber surroundlng the passageway through the baffle members, and a cup-shaped deflector member having its rounded, closed smaller end in the line of travel of the gases through the openings of I the baffle member and having a series 01 openings near its outer edge.

5. A muffler, comprising a casing. funnel shaped end pieces secured to the ends thereof, baffle plates within the casing, and water tubes connected to the top of the intake end piece and to the bottom of the outlet end piece and adapted to cause a circulation of water through the muffler.

6. A muffler, comprislng two cylindrical casings, bell shaped intake and outlet ends,

' funnel shaped baffle members within the in ner cylinder, cup shaped opposed deflector members apexing toward and in the direct line of travel of the exhaust gases through the centrally apertured baffle members, said deflector or radiator members being alter nately circumferentially and centrally per forated.

In testimony whereof, we affix our signa tures, in presence of two witnesses.

OTTO C. UNKE. WILLIAM H. UNKE.

lVitnesses: 7

" R. S. C. CALDWELL, KATHERINE HOLT. 

